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Radiological Dose & Risk Assessments

When the safety of your workers and the public is at stake, accurate and reliable health physics expertise is necessary to demonstrate compliance with federal and/or state regulations and guidelines regarding radiological exposure. ORAU’s highly-qualified health physicists perform site-specific radiation dose and risk assessments, using methods consistent with industry standards, to meet these regulatory requirements.

ORAU personnel have derived authorized limits for the U.S. Department of Energy per Order 458.1, dose-based screening values for the U.S. Nuclear Regulatory Commission per NUREG-1757, and derived concentration guideline levels (DCGLs) for the U.S. Army Corps of Engineers and the U.S. Defense Logistics Agency, among others.  

Dose models have included those for buildings and similar structural media, as well as environmental media including air, soil, sediment, rocks, surface water, and groundwater. Both retrospective and prospective assessments have been performed to determine radiation doses to past and current receptors, or hypothetical receptors based on central tendency or reasonable maximum exposure (i.e., critical group) scenarios. ORAU uses a variety of assessment tools to perform radiological dose assessments, including RESRAD, RESRAD-BUILD, DandD, MCNP, and MicroShield.

Impact Areas

ORAU offers dose modeling and assessment services in support of:

  • Safety evaluations
  • Regulatory compliance evaluations
  • Standards development
  • Regulatory rulemaking
Worker conducting a health physics assessment of a radiological site

Radium contamination from manufacturing is focus of survey work for NRC

ORAU survey teams and health physicists have provided technical assistance to the NRC Radium Program by determining the radiological status of more than 40 sites. Surveyors perform radiation scans and collect soil, dust, water, and radon sampling at the decommissioned sites. After these samples are analyzed, radium concentration results are used by ORAU health physicists to perform dose assessments.

Health physicist performing radium sampling test

Contact us

For more information about contracting with ORAU, contact Kathy Rollow at (865) 206-4264 or